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Apparatus and its principle for thermal aberration compensation
Applied Optics, 2022Thermal aberrations caused by absorption of laser beams degrade the image quality of exposure tools during the working process. Many compensators, such as lens movement or lens deformation, are used to compensate for low-order thermal aberrations of optical systems.
Xinfeng, Yu +2 more
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Thermal effects and thermal compensation in the OSIRIS camera
SPIE Proceedings, 2003Tight stability requirements for the imager/spectrograph OSIRIS (a Day One optical instrument for the GTC telescope) demand a careful treatment of thermal effects within the OSIRIS camera. Mostly due to the thermal response of refraction indices of its glasses (and not so much to curvature, spacing or thickness variations of the lenses), the camera ...
J. Jesus Gonzalez +4 more
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Thermal Compensation Method for Piezoresistive Pressure Transducer
IEEE Transactions on Instrumentation and Measurement, 2021Piezoresistive pressure sensors are employed in a wide range of applications, but their output signal shows a substantial dependence on the working temperature. Usually, there is a need for an additional component to ensure a proper temperature-compensated signal for the sensors. In this article, we describe a method for the sensor thermal compensation
Ricardo dos Santos Pereira +1 more
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Image compensation in the presence of thermal blooming
Applied Optics, 1983The effect of image compensation in viewing extended targets through thermal blooming is discussed. A wave-optics propagation code simulating multiple point sources and a low-bandwidth return-wave adaptive optics system is used to determine the steady-state thermally induced phase distortions and wave-front correction through various Zernike modes ...
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A compensated thermal anemometer and flowmeter
Electrical Engineering, 1951A THERMAL anemometer with unusual sensitivity, accuracy, and ruggedness has been developed for laboratory and industrial use. It operates from a heated noble metal thermopile which is placed in the airstream whose velocity is to be measured. The anemometer is practically independent of temperature over a considerable range since both the hot and cold ...
C. E. Hastings, C. R. Wcislo
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Thermal blooming compensation with adaptive optics
Optics Letters, 1978A multidither adaptive optical system has been used to correct for thermal blooming distortions. Stable correction factors of from 1.3 to 4 have been observed. Turbulence correction in the presence of blooming has also been observed. It is suggested that the geometry of the blooming scenario (location of absorption region, slue rate, etc.) and the ...
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Thermal-blooming compensation using the CLASP system
Applied Optics, 1978A closed-loop system for phase compensation of thermal blooming has been designed and tested. This system-called CLASP for closed-loop adaptive single parameter-is a single-mode outgoing-wave dither system. CLASP has demonstrated stable convergence to the optimum thermal-blooming-correction amplitude in a laboratory experiment.
C A, Primmerman, F B, Johnson, I, Wigdor
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Thermal blooming compensation instabilities
Journal of the Optical Society of America A, 1989A general model is developed for the time-dependent growth of small perturbations in thermally bloomed beams with and without correction. Intensity and phase every where along the path of an intense forward beam and a weak backward beam are determined from the initial beam and path conditions by five time-dependent Green functions.
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Measurement of surface temperature with a thermally compensated probe
Journal of Physics E: Scientific Instruments, 1971An electronically controlled differential transducer using microthermocouples (diameter <30 mu m) has been developed. The transducer is suitable for measuring the surface temperature of a small area (<1 mm2) when the thermal conductivity of the surface is low. The contact pressure of the transducer is very low, so that it is possible, for example,
K, Kalliomäki, P, Wallin
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On the thermal sampling compensation law
Journal of Electrostatics, 1999Abstract The arguments presented earlier by the author in this journal (J. Electrost. 36 (1996) 323), in order to explain the appearance of a compensation law in window polarization experiments performed at poling temperatures near the polymer transition temperature T g by a structure-dependent activation energy, are rephrased.
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